diff --git a/src/operations/operation.service.ts b/src/operations/operation.service.ts
index 0a211fb..d83b67b 100644
--- a/src/operations/operation.service.ts
+++ b/src/operations/operation.service.ts
@@ -1,5 +1,7 @@
 // vim: set tw=80 ts=2 sw=2 sts=2 :
 
+import * as moment from 'moment';
+
 import { Injectable } from '@angular/core';
 import { Observable } from 'rxjs/Rx';
 
@@ -21,8 +23,30 @@ export class OperationService {
     return this.restangular.one('operation', id);
   }
 
-  query(): Observable<Operation[]> {
-    return this.all().getList();
+  formatDate(date: Date|string) {
+    if(date instanceof Date) {
+      return moment(date).format('YYYY-MM-DD');
+    }
+
+    return date;
+  }
+
+  query(
+    accountId: number,
+    minDate: Date|string = null,
+    maxDate: Date|string = null
+  ): Observable<Operation[]> {
+    var dateRange: any = {};
+
+    if(minDate) {
+      dateRange.begin = this.formatDate(minDate);
+    }
+
+    if(maxDate) {
+      dateRange.end = this.formatDate(maxDate);
+    }
+
+    return this.all().getList([], dateRange);
   }
   
   get(id: number): Observable<Operation> {